1996年3月6日山梨県東部の地震(M5.8)の前に見られたドーナツ・パターン

概要

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A doughnut-shaped pattern of spatial distribution of small earthquakes appeared before an M5.8 earthquake which occurred in eastern Yamanashi on 6 March 1996. The pattern was observed in the conspicuous activity which started about two months before the M5.8 earthquake. The central part of the pattern, where remained as a gap during the active period, was filled with aftershocks of the earthquake on 6 March. The activity before the M5.8 earthquake was an abnormal one in a sense that CHASE (Yoshida et al., 1996) showed such a large value that exceeds three times of the standard deviation. We expect that watching change of seismicity by making a CHASE-plot is useful for estimating occurrence of major earthquakes, although we should examine the practicality and applicability of the method further using the data of much longer period and in other regions.
学術雑誌目次速報データベース由来の論文